langchain-hn-rag/README.md

LangChain RAG Demo

This repository demonstrates how to use LangChain for a Retrieval-Augmented Generation (RAG) application. The code retrieves Hacker News front page stories, categorizes them, stores them in a vector store, and performs retrieval based on user preferences.

Getting Started

1. Set the following environment variables:

   • OPENAI_API_KEY: Your OpenAI API key for chat and embedding models.
   • JINA_AI_KEY: Your Jina AI Reader key for text extraction.

2. Start local Weaviate vector store instance:

   docker compose up -d
   

3. Run the RAG application:

   uv run python indexing.py
   

Adjust the constants in indexing.py to change the number of stories to fetch and the categories to use. You can optionally enable MLflow tracing by setting ENABLE_MLFLOW_TRACING=True there (make sure to run mlflow server first).